What to wear under the zzZipMe Sack. Usually a long sleeve or short sleeve bodysuit is worn under the ZMS. In colder environments long johns or pajamas may be worn under the ZMS. In warmer environments, a short sleeve bodysuit or just a diaper.

Each baby is unique and parents should touch and feel their baby’s neck or tummy to ensure baby is not too warm or too cold. If baby is sweaty a layer should be removed. If baby feels too cool, an additional layer may be added under the ZMS.